Can Orbit use Keyboard instead of mouse

Question

I've created a custome behavior to cotroll the camera through the arrow keys. I want it to rotate about the orgin while always looking at the orgin. What i've gotten is whatever is at the orgin is rotating. I want the object to stay at the orgin and the camera float around it always facing it. I've noticed there is an Orbit behavior that uses the mouse. Is there a way for it to use the keyboard instead. if not any ideas on how to get my custom behavior to do it? I can email my code if needed.
Thanks,
James

Answer 1

Hi,
To rotate at the origin (around teh object).
First you have to get the TransformGroup of the Viewplatform.
- TransformGroup cameraTG = su.getViewingPlatform
).getViewPlatformTransform();
-The transfomrGroup 'cameraTg' is a 4x4 matrix. If you want to rotate around the object you must get the 3x3 matrix (orietation)of camerTG.
[x x x .]
[x x x .]
[x x x .]
- and the get this portion (position of the camera]
[ . . . x]
[ . . . x]
[ . . . x]
of the matrix
Check out some code:
public void rotY(float angle) (ORIETATION OF THE CAMERA)
targetTG.getTransform(transform3D);
Matrix3f rotationMatrix = new Matrix3f();
transform3D.getRotationScale(rotationMatrix);
//Rotate y-as with a specified angle
rotationMatrix.rotY(angle);
transform3D.set(rotationMatrix);
public void positionCamera(Vector3f position)(POSITION OF THE CAMERA)
targetTG.getTransform(transform3D);
Transform3D toMove = new Transform3D();
toMove.setTranslation(position);
transform3D.mul(toMove);
targetTG.setTransform(transform3D);